Answer:
It is done to avoid collision among the channel.
Explanation:
CSMA/CD stands for carrier sense multiple access/collision detection.
It is a media access protocol that tells the devices how to respond when a channel is used simultaneously by two devices. The main purpose is to manage the transmission when a collision is encountered.
In the given scenario when the channel is detected idle, the station does not transmits second frame in order to avoid collision. CSMA/CD protocol is designed so that after transmission of first frame, second frame transmission is started at step 2 instead of step 1.
Following is given the flow chart that depicts the working of the protocol CSMA/CD:
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